The diameter of a metallic ball is 4.2 cm. What is the mass of the ball, if the density of the metal is 8.9 cm3 ?

Sub Grade: 9

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340 g

345.3912 g

388 g

344.126 g

answer is B.

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Detailed Solution

Given
D= 4.2 CM
r= 2.1 cm
Formula
Density = mass/ volume
Volume v = 4/3 𝝿r3
= 4/3*22/7*2.1*2.1*2.1
=v = 38.808 cm3
Now find the mass
Mass = density * volume
= 8.9*38.808
= m = 345.3912 g

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